JPS5957111A - Apparatus for displaying compensation value of displacement sensor - Google Patents

Abstract

PURPOSE:To make it possible to simply and accurately display the compensation value of a displacement sensor, by a method wherein the difference of the electric signal output of the displacement sensor and reference is outputted and displayed while encoded by a code converting table to arbitrarily select the reference value and the compensation accuracy of the displacement sensor. CONSTITUTION:For example, in order to compensate the reference error of a displacement sensor with reference voltage of 3.211V, a digital switch 4 is set to 3.211V and a keyboard 6b is manipulated to read a code converting table. When the output of the displacement sensor is connected to an input terminal 1a, it is compared with the reference voltage of a comparison circuit 2. When the error of the output voltage of the displacement sensor and the reference voltage is 0.02V, this value is encoded by an encoder circuit 6 and a compensation code is outputted to be displayed by a display circuit 7. In addition, the recording paper of a printing apparaus 9 is also printed while the printed paper is adhered to the outer surface of the displacement sensor and the control input of a computer can automatically compensate the error. As the result, the compensation value of the displacement sensor can be simply and accurately displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a device that displays a difference from a reference value of a detection output of a displacement sensor used for control input of a microcomputer as a compensation value. In particular, the present invention relates to a compensation value display device for a displacement sensor that is versatile and can arbitrarily select a reference value and compensation accuracy.

[Description of prior art]

Conventionally, in order to compensate for the error in the detection output of a displacement sensor that detects mechanical displacement as an electrical signal, the amount of error is measured from the standard reference value of the sensor's reference output using a sensor checker, and based on this amount of error, For example, the standard output of the sensor has been compensated by mechanical compensation means such as shims.

For this reason, the conventional compensation method has the drawback that it requires a large number of man-hours to set the compensation value for the sensor, and also requires experience and intuition for compensation.

In order to solve the above-mentioned drawbacks, the present inventor proposed a sensor error compensation method that can automatically, easily and accurately compensate for sensor errors without requiring experience or intuition. No. 57-151153 was filed.

This error compensation method includes installing a digital switch in the input circuit hardware of the microcomputer that allows the value to be manually set, and measuring the error of the standard output of this sensor from the standard reference value to obtain error data. By converting this error data into encoded compensation data and recording it in one component of this sensor, and literally setting the recorded compensation data number to the digital switch, the microcomputer can control the contents of this digital switch. This method is characterized in that the output of the sensor is compensated according to the following.

The present invention relates to an apparatus that obtains the above error data, converts the error data into encoded compensation data, and displays the encoded compensation data.

[Purpose of the invention]

The present invention provides a displacement sensor compensation value display device that can easily and accurately display the compensation value of a displacement sensor, and can arbitrarily select the reference value and compensation accuracy of the sensor. With the goal.

[Features of the invention]

The present invention tests a displacement sensor that is used as an input sensor of a microcomputer control device and detects mechanical displacement as an electrical signal, and a compensation value that displays the deviation from the reference value of the electrical signal at a reference displacement as a compensation value. The display device includes a terminal for connecting the electric signal of the displacement sensor under test, a reference voltage generation circuit for generating a voltage corresponding to the displacement reference value of this displacement sensor, and a digital switch for providing a set value to this reference voltage generation circuit. , a comparator circuit that compares the output voltage of the reference voltage generating circuit with the voltage corresponding to the electrical signal applied to the terminal, and a comparator circuit that uses the output of the comparator circuit as an input to represent a compensation value for the control input of the microcomputer. The present invention is characterized in that it includes an encoding circuit that encodes a code according to a predetermined rule, and a display circuit that displays this code.

[Explanation based on examples]

A detailed explanation will be given below based on the drawings of the embodiment.

The figure is an electric circuit configuration diagram of a compensation value display device for a displacement sensor according to an embodiment of the present invention. 1 is an output amplification circuit of the displacement sensor. An input terminal 1a of this amplifier circuit 1 is connected to a displacement sensor output (not shown). The output of this amplifier circuit 1 is connected to a comparison input of a comparison circuit 2. A reference voltage generation circuit 3 is connected to a reference input of the comparison circuit 2.

This reference voltage generation circuit 3 includes this reference voltage generation circuit 3.
A digital switch 4 is connected to give a set value to the .

Further, the comparison output of the comparison circuit 2 is connected to the input of the encoding circuit 6 via the AD conversion circuit 5.

This encoding circuit 6 encodes the digital output of the AD conversion circuit 5 as a compensation value for the control input of a microcomputer (not shown). This encoding circuit 6 is provided with a ROM 6a and a keyboard 6b for arbitrarily determining compensation accuracy. This ROM 6a stores code conversion tables with various types of compensation accuracy, and by operating the keyboard 6b, it is possible to read out the code conversion table with a desired compensation accuracy for the digital output value of the AD conversion circuit 5 from the RAM 6a. .

A display circuit 7 for displaying the encoded code is connected to the output of the encoding circuit 6. Further, a printing device 9 for printing encoded codes is connected to the output of the encoding circuit 6.

With this configuration, the reference value of the displacement sensor is set by operating the digital switch 4 in advance, and the keyboard 6
Set the compensation accuracy by operating b.

For example, in order to compensate for the reference error of the displacement sensor whose reference output is r 3.211 (V) J, set the digital switch 4 to r 3.211 (V) J and operate the keyboard 6b as shown in the figure. Then read out the code conversion table as shown in Table 1.

Table 1 Next, when the output of the displacement sensor is connected to the input terminal 1a, the output is amplified by the amplifier circuit 1 and compared with the reference voltage r 3.211 (V) J by the comparison circuit 2. Now, the error value between the output voltage of the displacement sensor and the reference voltage is r
o, 02 (V) J, this value is encoded by the encoding circuit 6 and the compensation code r 0OOOIO
J is output and displayed on the display circuit 7. Furthermore, r0OOOIOJ is printed on the recording paper of the printing device 9.

The paper on which r 0OOOIOJ is printed is pasted on the outer surface of the displacement sensor, and by setting the number r 0OOOIOJ to the digital switch during computer control, the computer control input can automatically compensate for errors. .

Next, 1. When using a displacement sensor for another measured part, for example, what is the standard error of a displacement sensor with a standard output r of 4.678 (V) J? When performing ffi compensation, the digital switch 4 is set to r 4.678 (V) J, and the code conversion table as shown in Table 2 is read out by operating the keyboard 6b.

Table 2 and below Similarly, the output of the displacement sensor is connected to the input terminal 1a, and the output is amplified by the amplifier circuit 1 and compared with the reference voltage r 4.678 (V) J by the comparison circuit 2. Now, the misalignment value of the output voltage of the displacement sensor with the reference voltage is rO
, 04 (V) J, this value is encoded by the encoding circuit 6, and the compensation code ``000010J'' is outputted and displayed on the display circuit 7, and r 0OOOO10J is printed on the recording paper of the printing circuit 9. It will be printed.

The compensation accuracy in Table 2 is determined in units of rO,02 (V) J, so the error value of this displacement sensor is "0.05
(V) Even if it is J, the same display and printing will be done.

Note that the code conversion table shown in the above example is not limited to the above example, and other tables such as a table encoded with two-digit numbers using the hexadecimal system may be used, and the compensation accuracy may be adjusted as desired depending on the part to be measured. The code conversion table can be read.

〔Effect of the invention〕

As described above, according to the present invention, the displacement reference value of the displacement sensor used for the control input of the microcomputer is set by a digital switch, and the set value of this digital switch is used as the reference input, and the electric signal output of the displacement sensor is By outputting the difference between the value of this electric signal and the reference value as a comparison input, encoding it using a desired code conversion table, and displaying and printing this code, the reference value and compensation accuracy of the displacement sensor can be arbitrarily set. This has an excellent effect in that the compensation value of the displacement sensor can be selected and displayed easily and accurately.

Further, by printing this code as it is on a recording sheet and pasting it on the outer surface of the displacement sensor, there is an advantage that the labor for transcribing is reduced and transcription errors are eliminated.

In particular, when a large variety of displacement sensors and microcomputers are mass-produced and used, the present invention is extremely useful in compensating for errors in the displacement sensors.

[Brief explanation of drawings]

The figure is an electric circuit configuration diagram of a compensation value display device for a displacement sensor according to an embodiment of the present invention.

Claims (1)

[Claims] +1+ A displacement sensor that is used as an input sensor for a microcomputer control device and detects mechanical displacement as an electrical signal is tested, and the deviation of the electrical signal from the reference value at the reference displacement is displayed as a compensation value. In the compensation value display device, a terminal for connecting the electric signal of the displacement sensor under test, a reference voltage generation circuit for generating a voltage corresponding to the displacement reference value of this displacement sensor, and a set value is given to this reference voltage generation circuit. a digital switch; a comparator circuit that compares the output voltage of the reference voltage generation circuit with the voltage corresponding to the electrical signal applied to the terminal number; and compensation of the control input of the microcomputer using the output of the comparator circuit as an input. A compensation value display device for a displacement sensor, comprising: an encoding circuit that encodes a value as a code according to a predetermined law; and a display circuit that displays this code.